Question 1

Novae always occur in a close binary star system.

Accepted Answer

A) True 
 B)False  True

Question 2

Looking at the elements that make up our world, which are the products of low versus high mass stars?

Accepted Answer

Much of the lighter material in the Earth's crust and our bodies, such as carbon, oxygen, and nitrogen, is the product of low mass stars and given off in planetary nebula, type I supernovae, and stellar winds around giants. But the denser elements of the mantle and core, especially silicon and iron, are delivered to the interstellar medium from the cores of high mass stars by violent type II supernovae.

Question 3

Iron is the most stably bonded atomic nucleus.

Accepted Answer

A) True 
 B)False  True

Question 4

Will our Sun become a supernova? Why?

Accepted Answer

No, it is not in a close binar

Question 5

The heaviest nuclei of all are formed

Accepted Answer

A)  by neutron capture during a type II supernova explosion. 
B)  during a nova explosion. 
C)  during a carbon detonation supernova. 
D)  during carbon burning in the giant stage. 
E)  during the triple alpha process. 
A)  by neutron capture during a type II supernova explosion. 
B)  during a nova explosion. 
C)  during a carbon detonation supernova. 
D)  during carbon burning in the giant stage. 
E)  during the triple alpha process.

Question 6

The supernova that formed M-1, the Crab Nebula, was observed in

Accepted Answer

A)  1572 AD by Tycho Brahe. 
B)  1604 AD by Johannes Kepler. 
C)  1054 AD by Chinese and Middle Eastern astronomers. 
D)  1006 by observers in the southern hemisphere. 
E)  about 9,000 BC by all our ancestors. 
A)  1572 AD by Tycho Brahe. 
B)  1604 AD by Johannes Kepler. 
C)  1054 AD by Chinese and Middle Eastern astronomers. 
D)  1006 by observers in the southern hemisphere. 
E)  about 9,000 BC by all our ancestors.

Question 7

The supernova of 1054 AD produced

Accepted Answer

A)  a remnant still visible to the naked eye, the Crab Nebula, M-1. 
B)  a pulsar with a period of 33 milliseconds, visible optically. 
C)  the closest known neutron star to our Sun. 
D)  the most famous black hole. 
E)  no remaining visible trace, as it was a type I supernova. 
A)  a remnant still visible to the naked eye, the Crab Nebula, M-1. 
B)  a pulsar with a period of 33 milliseconds, visible optically. 
C)  the closest known neutron star to our Sun. 
D)  the most famous black hole. 
E)  no remaining visible trace, as it was a type I supernova.

Question 8

Which type of heavy atomic nuclei are most common, and why?

Accepted Answer

A)  Transuranium elements, for only very heavy elements are made in supernovae. 
B)  Odd numbered elements, because hydrogen is the building block for all heavier elements. 
C)  Even numbered elements, for helium is "giant food" for everything beyond itself. 
D)  Metals, for iron is the last abundant element formed before the type II supernova. 
E)  Noble gases, for they are the most stable elements. 
A)  Transuranium elements, for only very heavy elements are made in supernovae. 
B)  Odd numbered elements, because hydrogen is the building block for all heavier elements. 
C)  Even numbered elements, for helium is "giant food" for everything beyond itself. 
D)  Metals, for iron is the last abundant element formed before the type II supernova. 
E)  Noble gases, for they are the most stable elements.

Question 9

An object more massive than the Sun, but roughly the size of a city, is a

Accepted Answer

A)  supernova remnant. 
B)  white dwarf. 
C)  brown dwarf. 
D)  neutron star. 
E)  red dwarf. 
A)  supernova remnant. 
B)  white dwarf. 
C)  brown dwarf. 
D)  neutron star. 
E)  red dwarf.

Question 10

All neutron stars are pulsars, but not all pulsars are neutron stars.

Accepted Answer

A) True 
 B)False

Question 11

Compare the amount of time a 20 solar mass star will stay on the main sequence to the length of time its iron core can exist.

Accepted Answer

A 20 solar mass star will stay

Question 12

Once carbon is formed in massive star cores, the majority of nuclei formed form then on will belong to even numbered elements, due to addition to more helium nuclei as alpha particles.

Accepted Answer

A) True 
 B)False

Question 13

Beyond the formation of iron, nuclear energy can be produced only by

Accepted Answer

A)  fusion of still heavier elements. 
B)  ionization of the radioactive nuclei. 
C)  fission of heavy nuclei back toward lighter ones. 
D)  gravity. 
E)  the dark force. 
A)  fusion of still heavier elements. 
B)  ionization of the radioactive nuclei. 
C)  fission of heavy nuclei back toward lighter ones. 
D)  gravity. 
E)  the dark force.

Question 14

What would be most likely to disrupt the normal evolution of a star? Give examples of this.

Accepted Answer

If it has a close companion, mass transf

Question 15

How are elements heavier than iron made? Why are they rare?

Accepted Answer

The elements heavier than iron are forme

Question 16

The maximum mass of a white dwarf is about ________ times the mass of the Sun.

Accepted Answer

The answer of The maximum mass of a white dwarf...

Question 17

The density of a neutron star is comparable to the density of an atomic nucleus.

Accepted Answer

A) True 
 B)False

Question 18

In a neutron star, the core is

Accepted Answer

A)  made of compressed neutrons in contact with each other. 
B)  electrons and protons packed so tightly they are in contact. 
C)  constantly expanding and contracting. 
D)  primarily iron and silicon. 
E)  no longer rotating. 
A)  made of compressed neutrons in contact with each other. 
B)  electrons and protons packed so tightly they are in contact. 
C)  constantly expanding and contracting. 
D)  primarily iron and silicon. 
E)  no longer rotating.

Question 19

The Crab Nebula and the Orion Nebula are regions where new stars are being formed.

Accepted Answer

A) True 
 B)False

Question 20

Neutron stars have

Accepted Answer

A)  very strong bi-polar magnetic fields. 
B)  weak or non-existent magnetic fields. 
C)  periods of days or weeks. 
D)  monopolar fields that switch polarity every rotation. 
E)  no relation to pulsars. 
A)  very strong bi-polar magnetic fields. 
B)  weak or non-existent magnetic fields. 
C)  periods of days or weeks. 
D)  monopolar fields that switch polarity every rotation. 
E)  no relation to pulsars.

Novae always occur in a close binary star system.

Looking at the elements that make up our world, which are the products of low versus high mass stars?

Iron is the most stably bonded atomic nucleus.

Will our Sun become a supernova? Why?

The heaviest nuclei of all are formed

The supernova that formed M-1, the Crab Nebula, was observed in

The supernova of 1054 AD produced

Which type of heavy atomic nuclei are most common, and why?

An object more massive than the Sun, but roughly the size of a city, is a

All neutron stars are pulsars, but not all pulsars are neutron stars.

Compare the amount of time a 20 solar mass star will stay on the main sequence to the length of time its iron core can exist.

Once carbon is formed in massive star cores, the majority of nuclei formed form then on will belong to even numbered elements, due to addition to more helium nuclei as alpha particles.

Beyond the formation of iron, nuclear energy can be produced only by

What would be most likely to disrupt the normal evolution of a star? Give examples of this.

How are elements heavier than iron made? Why are they rare?

The maximum mass of a white dwarf is about ________ times the mass of the Sun.

The density of a neutron star is comparable to the density of an atomic nucleus.

In a neutron star, the core is

The Crab Nebula and the Orion Nebula are regions where new stars are being formed.

Neutron stars have

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Exam 11: Stellar Explosions

Novae always occur in a close binary star system.

Looking at the elements that make up our world, which are the products of low versus high mass stars?

Iron is the most stably bonded atomic nucleus.

Will our Sun become a supernova? Why?

The heaviest nuclei of all are formed

The supernova that formed M-1, the Crab Nebula, was observed in

The supernova of 1054 AD produced

Which type of heavy atomic nuclei are most common, and why?

An object more massive than the Sun, but roughly the size of a city, is a

All neutron stars are pulsars, but not all pulsars are neutron stars.

Compare the amount of time a 20 solar mass star will stay on the main sequence to the length of time its iron core can exist.

Once carbon is formed in massive star cores, the majority of nuclei formed form then on will belong to even numbered elements, due to addition to more helium nuclei as alpha particles.

Beyond the formation of iron, nuclear energy can be produced only by

What would be most likely to disrupt the normal evolution of a star? Give examples of this.

How are elements heavier than iron made? Why are they rare?

The maximum mass of a white dwarf is about ________ times the mass of the Sun.

The density of a neutron star is comparable to the density of an atomic nucleus.

In a neutron star, the core is

The Crab Nebula and the Orion Nebula are regions where new stars are being formed.

Neutron stars have

The Night Sky

Light and Telescopes

The Solar System

Earth and Its Moon

The Eight Planets

Small Bodies in the Solar System

Formation of Planetary Systems

The Sun

Measuring the Stars

Star Formation and Evolution

Black Holes

The Milky Way Galaxy

Galaxies

Cosmology and the Universe

Filters